Vigor
'vigor' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pep that I've seen before include "Ginger; tax-free investment" , "savings plan" , "Palindrome for vigour" , "Go" , "Palindromic energy or vim" .)
'vigor' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for spirit that I've seen before include "Liveliness - hard liquor" , "Courage, strong drink" , "character like Ariel" , "Distilled alcoholic drink" , "Ghost or animation" .)